Re: Difference between index=2, and index=-2?

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On Thursday 22 May 2008 21:03, Jaroslav Kysela wrote:
> On Thu, 22 May 2008, Nigel Henry wrote:
> > When I set index options if cards are ordered incorrectly, I set these
> > as: index=0
> > index=1
> > index=2 , etc
> >
> > On my Debian installs, including Kubuntu, /etc/modprobe.d/alsa-base, at
> > the bottom of the file are options for abnormal drivers that try to grab
> > card0.
> >
> > All of these drivers are set as index=-2
> >
> > I looked in the man page for modprobe.conf, but there is no info about
> > the values for index options.
> >
> > What exactly is the difference between index=2, and index=-2?
> >
> > Just an academic question helping me to be a bit more clued up.
>
> -2 means bitmask which "slots" (indexes) can be used. It's 0xfffffffe in
> hexa, thus only first bit is zero (disable). It means, allocate any free
> slot (index) except from slot (index) 0.
>
>       Jaroslav

Many thanks Jaroslav, that explains all.

Nigel.

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